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A floor is covered by 800 tiles measuring 10 cm square.How many square tiles of side 8 cm would be needed to cover the same floor?

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  1. area covered by 10 by 10 tiles = 800 x 100 or 80000 cm^2
    each 8 by 8 covers 64 cm^2
    so number of smaller tiles = 80000/64 = 1250 tiles

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  2. Square tiles = 8 × 8 = 64cm^2
    Previous tiles = 10 × 10 = 100
    Area covered = 100 × 800 = 80000cm^2
    No of tiles = 80000÷64 = 1250 tiles

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